What caused Southwest double tire blowout

Hello there after a long Christmas break. The last few days have produced one air-travel safety story worth reprinting here ... the followup by the Sacramento (Calif.) Bee on a scary incident: Two tires blew out on a Southwest 737 as it started to take off from Sacramento, forcing the plane to make an emergency stop. It would seem this is better than having tires blow out on landing but the incident was still frightening for passengers. Read about the incident and efforts to determine the cause here ....